2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/222309We study analytically the optical properties of a simple model for an electron-hole pair on a ring subjected to perpendicular magnetic flux and in-plane electric field. We show how to tune this excitonic system from optically active to optically dark as a function of these external fields. Our results offer a simple mechanism for exciton storage and read-out.5 pages, 5 figuresMesoscale and Nanoscale Physicstext